Abstract
To improve the performances of UV-curable coatings, the effects of nano-silica slurry, aluminum and UV-curing time on the glossiness and infrared emissivity of UV-curable coatings were investigated by orthogonal experiments. The results showed that UV-curing time is a key factor affecting the performance of the coating. When the UV-curing time was increased from 30 to 360 s, the glossiness of the UV-curable coating slowly decreased from 11.1% to 9.0%. The L’ value decreased from 78.6 to 75.0. The infrared emissivity of the coating with UV-curing time of 180 s was 0.106, which was the lowest. The coating hardness with different curing time was 6H. The coating roughness was high when the UV-curing time was 30–120 s. When the UV-curing time was greater than 300 s, the coating adhesion was 0 and the coating had the best impact resistance of 500 N/cm. The overall performance of the aluminum/UV-curable coating was optimal when the UV-curing time was 180 s. This research is able to promote the industrial development of UV-curable, infrared, low-emissivity coatings.
Highlights
With the rapid development of detective technology, infrared emissivity has become an important indicator [1], widely used in the military [2]
These experiments were done to study the three factors of Al powder concentration, and nano-silica slurry concentration, UV-curing time is the key factor for the preparation of infrared nano-silica slurry concentration, and UV-curing time
It is concluded that compared with Al low-emissivity, UV-curable coatings
Summary
With the rapid development of detective technology, infrared emissivity has become an important indicator [1], widely used in the military [2]. Infrared low-emissivity materials have become an important research topic [3], and the corresponding coating on the surface of such equipment has become a convenient and efficient choice [4], which can prevent the equipment from buckling, deformation, and being detected [5]. Due to the high glossiness of aluminum powder, the glossiness of infrared low-emissivity coatings after adding aluminum powder is usually high, which is not conducive to compatibility with visible light. Low glossiness is required for infrared and visible light-compatible coatings. As a new infrared low-emissivity resin, UV-curable coating has the advantages of high curing rate [7], but has the disadvantages of low adhesion and high glossiness [8], which limits its application in infrared low-emissivity materials and is not conducive to infrared light and visible light compatibility [9]. The widely used UV coating system in the industry is unsaturated urethane acrylate [10], and the UV-curable light wavelength is the irradiation wavelength of a medium pressure mercury lamp (310–1000 nm) [11]
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